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One type of internal diachronic change that has been extensively studied for spoken languages is grammaticalization whereby lexical elements develop into free or bound grammatical elements. Based on a wealth of spoken languages, a large amount of prototypical grammaticalization pathways has been identified. Moreover, it has been shown that desemanticization, decategorialization, and phonetic erosion are typical characteristics of grammaticalization processes. Not surprisingly, grammaticalization is also responsible for diachronic change in sign languages. Drawing data from a fair number of sign languages, we show that grammaticalization in visual-gestural languages – as far as the development from lexical to grammatical element is concerned – follows the same developmental pathways as in spoken languages. That is, the proposed pathways are modalityindependent. Besides these intriguing parallels, however, sign languages have the possibility of developing grammatical markers from manual and non-manual co-speech gestures. We will discuss various instances of grammaticalized gestures and we will also briefly address the issue of the modality-specificity of this phenomenon.
In this article, it will be argued that the concept of functional layering – an extension of Hopper’s (1991) concept of layering – can be fruitfully applied to understand the mechanisms behind the sometimes large and messy looking synchronic picture of diverse meanings which one and the same construction can fulfill at a particular point in time. The concept will be used to account for the meaning spectrum of the present-day English progressive, which, it will be argued, no monosemic approach to date can account for. Taking a look at the diachrony of the construction will help to reveal that the various “exceptions” found in the use of the progressive can be understood as reflections of different stages in its development. Older, less grammaticalized or less well-defined usage patterns thus often survive in certain restricted niches next to the newer, more grammaticalized or more clear-cut functions, representing different diachronic layers. In addition to this diachronic motivation for synchronic meaning variety, the article will also address the crucial question of how a present-day hearer of a progressive form is able to decode the specific meaning intended by the speaker based on contextual clues. The article ends with some suggestions for further applications of the concept of functional layering.